Arsenazo I, GR indicator

Name: Arsenazo I, GR indicator
Brand: Vaqora Chemicals
SKU: VQ-000474

About Arsenazo I, GR indicator

Arsenazo I (CAS 520-10-5) is a biological stain offered by Vaqora Chemicals (AR grade). The compound has the formula C16H13AsN2O11S2, corresponding to a molecular weight of 548.3 g/mol. Its systematic (IUPAC) name is 3-[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid. Common synonyms include Neothorone.

It is supplied as a dark brown to black powder. Keep the container tightly sealed and store it in a cool, dry area. It carries the GHS signal word “Danger” with 4 hazard statements. Review the Safety Data Sheet before use.

Key uses span histology and cytology staining, microscopy and clinical laboratories. It is used across academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

We offer Arsenazo I in 1 g, 5 g and 100 g packs with a batch-specific COA, and ship to customers worldwide.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories

Industries

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	Arsenazo I, GR indicator
Catalogue No.	VQ-000474
CAS Number	520-10-5
IUPAC name	3-[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid
Molecular formula	C₁₆H₁₃AsN₂O₁₁S₂
Molecular weight	548.3 g/mol
Exact mass	547.9177
Grade	AR
HSN code	29319090
InChIKey	NJZWLEZSGOTSHR-UHFFFAOYSA-N
SMILES	C1=CC=C(C(=C1)N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)O)S(=O)(=O)O)O)O)[As](=O)(O)O
PubChem CID	68217

Physical properties
Physical form	Powder
Appearance	Dark brown to black powder
H-bond donors / acceptors	6 / 13
TPSA	248 Å²
Synonyms	Neothorone, 2,7-Naphthalenedisulfonic acid, 3-((2-arsonophenyl)azo)-4,5-dihydroxy-, (E)-3-((2-Arsonophenyl)diazenyl)-4,5-dihydroxynaphthalene-2,7-disulfonic acid, (3E)-3-[(2-arsonophenyl)hydrazinylidene]-5-hydroxy-4-oxonaphthalene-2,7-disulfonic acid, Disodium 3-((o-arsonophenyl)azo)-4,5-dihydroxynaphthalene-2,7-disulphonate, Trisodium 2-(-hydrogen arsonatophenylazo)-1,8-dihydroxynaphthalene-3,6-disulphonate, 2,7-Naphthalenedisulfonic acid, 3-(2-arsonophenylazo)-4,5-dihydroxy-

Safety & hazard information (GHS)

Toxic

Environmental hazard

Signal word: Danger

Hazard statements

H301Toxic if swallowed
H331Toxic if inhaled
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects

Precautionary statements: P261, P264, P270, P271, P273, P301 + P316, P304 + P340, P316, P321, P330, P391, P403 + P233, P405, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Arsenazo I, GR indicator?

The CAS Registry Number of Arsenazo I, GR indicator is 520-10-5. It is also known as Neothorone, 2,7-Naphthalenedisulfonic acid, 3-((2-arsonophenyl)azo)-4,5-dihydroxy-, (E)-3-((2-Arsonophenyl)diazenyl)-4,5-dihydroxynaphthalene-2,7-disulfonic acid.

What is the molecular formula and molecular weight of Arsenazo I, GR indicator?

Arsenazo I, GR indicator has the molecular formula C16H13AsN2O11S2 and a molecular weight of 548.3 g/mol. Its IUPAC name is 3-[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid.

Which grade and pack sizes of Arsenazo I, GR indicator can I order?

We supply Arsenazo I, GR indicator in AR grade, in 1 g, 5 g, 100 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Arsenazo I, GR indicator?

Yes. Every lot of Arsenazo I, GR indicator is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Arsenazo I, GR indicator be shipped internationally?

Yes. Arsenazo I, GR indicator is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.